pyriform area vs piriform area

pyriform area and piriform area both are nouns.

Word	Noun	Adjective	Verb	Adverb
pyriform area	Yes	No	No	No
piriform area	Yes	No	No	No

As nouns, pyriform area and piriform area are synonyms defined as:

pyriform area and piriform area: pear-shaped neural structure on either side of the brain in the rhinencephalon

Other synonyms of pyriform area include piriform lobe, pyriform lobe.

pyriform area (noun)	piriform area (noun)
pear-shaped neural structure on either side of the brain in the rhinencephalon	pear-shaped neural structure on either side of the brain in the rhinencephalon